OpenEuphoria

Re: EXW crash

• Posted by Robert Craig <rds at RapidEuphoria.com> Dec 22, 2002
• 445 views

Martin Stachon writes:
> Sometimes, exw.exe crashes because of programmers error, 
> like invalid pointer etc.
> This window is shown :
>
> Application Error: C:\EUPHORIA\BIN\EXW.EXE  [X]
> -----------------------------------------------
> The instruction at xxxxxxxx referenced memory at ffffffff.
> The memory could not be read from.
>
> Click OK to terminate the application.
>
>                                           [OK]
>
> The error message is not from Windows, but from some 
> C runtime libraries linked in EXW.EXE. Do you think it would 
> be possible for exw to add its own handler for this and show 
> where the crash happened and do some cleanup?

Excellent idea! I should have tried this long ago. Somehow
I thought it wasn't possible. I set up an exception handler
under Watcom/DOS a long time ago, and it didn't work at all,
but I never tried it with Windows. I think it will probably work 
with Linux and FreeBSD too. 

As a test, I just added a handler for both segmentation violation
and illegal instruction to exw, and it worked. I got a nice 
Euphoria traceback pointing to:  poke(0, 999), where 
before I would have seen a useless message like the one
you show above. When I think of all the hours people have
spent debugging these sorts of errors ...  Yikes!

(2.4 alpha-test should be available in a few weeks.)

Regards,
   Rob Craig
   Rapid Deployment Software
   http://www.RapidEuphoria.com